net: e1000: typo using wrong argument to sizeof

Typo from 4b29bdb0ed08412d225a8be94f61fc6c37a59dd5

Signed-off-by: Matthew McClintock <msm@freescale.com>
diff --git a/drivers/net/e1000.c b/drivers/net/e1000.c
index 18584ef..60b04c2 100644
--- a/drivers/net/e1000.c
+++ b/drivers/net/e1000.c
@@ -5189,7 +5189,7 @@
 			return 0;
 		}
 
-		memset(nic, 0, sizeof(*dev));
+		memset(nic, 0, sizeof(*nic));
 		memset(hw, 0, sizeof(*hw));
 
 		hw->pdev = devno;